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Long-Term Debt Long-Term Debt (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2013 | Jan. 31, 2012
Gross interest expense | $ 8,500,000 | $ 8,500,000 | $ 16,900,000 | $ 16,900,000
Amortization of deferred financing costs | 500,000 | 500,000 | 1,000,000 | 1,000,000
Interest costs incurred, capitalized | $ 0 | $ 0 | $ 0 | $ 100,000

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